40051905 has 16 divisors (see below), whose sum is σ = 67456320. Its totient is φ = 20236608.

The previous prime is 40051889. The next prime is 40051909. The reversal of 40051905 is 50915004.

It is not a de Polignac number, because 40051905 - 2⁴ = 40051889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40051909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69982 + ... + 70551.

It is an arithmetic number, because the mean of its divisors is an integer number (4216020).

Almost surely, 2^40051905 is an apocalyptic number.

It is an amenable number.

40051905 is a deficient number, since it is larger than the sum of its proper divisors (27404415).

40051905 is a wasteful number, since it uses less digits than its factorization.

40051905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140560.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 40051905 is about 6328.6574405635. The cubic root of 40051905 is about 342.1430525659.

Adding to 40051905 its reverse (50915004), we get a palindrome (90966909).

The spelling of 40051905 in words is "forty million, fifty-one thousand, nine hundred five".